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There is a newer version: 2.4.0

package org.bukkit;

import com.google.common.collect.Maps;

import java.util.Map;

/**
 * Represents the various difficulty levels that are available.
 */
public enum Difficulty {
  /**
   * Players regain health over time, hostile mobs don't spawn, the hunger
   * bar does not deplete.
   */
  PEACEFUL(0),

  /**
   * Hostile mobs spawn, enemies deal less damage than on normal difficulty,
   * the hunger bar does deplete and starving deals up to 5 hearts of
   * damage. (Default value)
   */
  EASY(1),

  /**
   * Hostile mobs spawn, enemies deal normal amounts of damage, the hunger
   * bar does deplete and starving deals up to 9.5 hearts of damage.
   */
  NORMAL(2),

  /**
   * Hostile mobs spawn, enemies deal greater damage than on normal
   * difficulty, the hunger bar does deplete and starving can kill players.
   */
  HARD(3);

  private final static Map BY_ID = Maps.newHashMap();

  static {
    for (Difficulty diff : values()) {
      BY_ID.put(diff.value, diff);
    }
  }

  private final int value;

  Difficulty(final int value) {
    this.value = value;
  }

  /**
   * Gets the Difficulty represented by the specified value
   *
   * @param value Value to check
   * @return Associative {@link Difficulty} with the given value, or null if
   * it doesn't exist
   * @deprecated Magic value
   */
  @Deprecated
  public static Difficulty getByValue(final int value) {
    return BY_ID.get(value);
  }

  /**
   * Gets the difficulty value associated with this Difficulty.
   *
   * @return An integer value of this difficulty
   * @deprecated Magic value
   */
  @Deprecated
  public int getValue() {
    return value;
  }
}